I'm using a radgrid with Telerik library and when I change page or click a button (ajax fires) the error is the following: 

Server Error in '/' Application.

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The HTTP verb POST used to access path '/' is not allowed.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The HTTP verb POST used to access path '/' is not allowed.

Source Error:

Stack Trace:

[HttpException (0x80004005): The HTTP verb POST used to access path '/' is not allowed.]
   System.Web.DefaultHttpHandler.BeginProcessRequest(HttpContext context, AsyncCallback callback, Object state) +2871482
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8679426
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

This error occurs only on the home page!!!! At any other page of site the same module works without any errors.

I got the same error. When the main page first loads (http://localhost:60941/) when I click on the expand tree. The error does not occure again if I browse to other pages and do the same on the home page after browsing.

I noticed that the URL for the working page will show later on

http://localhost:60941/default.aspx

(the deafult.aspx is not there on the fist load)

I am using the styleshout-coolwater skin

OS: Windows XP 32-bit

Database: MSSQL2005

MojoPortal: 2.3.3.0

This is a byproduct of the url rewriter. If you have a form postback to the root page / then it will give this error. If you know the page URL (non-root), for example /home.aspx, then you can avoid this error.